I'd classify Google's font CDN as a tracker also.
* Your IP
* Your user agent
* Date & time of visit
* HTTP Referrer (knows what site you visit)
There's little stopping them from correlating your IP with your Google account, if you used the account from your IP and agreed to their services.
Oh, there's also their DNS server.
Read more on my site: https://danuker.go.ro/how-to-protect-your-personal-data.html
Using uBlock Origin, I block third party requests by default.
I need to make adjustments for few sites, and IceWeasel's (also Firefox's) Reader View unbreaks articles even with off-domain CSS.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko